On 9/12/2022 04:06, Shyam Sundar S K wrote:
AMD PMF driver provides the flexibility to turn "on" or "off" CnQF feature (introduced in the earlier patch). Add corresponding ABI documentation for the new sysfs node. Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx> --- Documentation/ABI/testing/sysfs-amd-pmf | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-amd-pmf diff --git a/Documentation/ABI/testing/sysfs-amd-pmf b/Documentation/ABI/testing/sysfs-amd-pmf new file mode 100644 index 000000000000..c75d7426c2c7 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-amd-pmf @@ -0,0 +1,11 @@ +What: /sys/devices/platform/AMDI0102\:00/cnqf/feat
Presumably future devices beyond AMDI0102 can possibly support this too. So maybe this should be "/sys/devices/platform/*/cnqf/feat".
+Date: September 2022 +Contact: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx> +Description: Reading this file tells if the AMD Platform Management(PMF) + Cool n Quiet Framework(CnQF) feature is enabled or not. + + This feature is not enabled by default and gets only turned on + if OEM BIOS passes a "flag" to PMF ACPI function (index 11 or 12) + or in case the user writes "on". + + To turn off CnQF user can write "off" to the sysfs node.
I think you want to have a comment here to the effect that "systems that support auto mode will not have this sysfs file available".
